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Lighthouse of Alexandria (منارة الإسكندرية)
The Lighthouse of Alexandria, also called the Pharos of Alexandria, was a lighthouse built on the island of Pharos in Egypt around 297 BCE, one of the Seven Wonders of the Ancient World.
Lighting
Lighting is the deliberate application of light to make spaces usable and comfortable, consuming about 2,200 TWh in 2024, roughly 8% of global electricity demand.
Lightning (connector)
Lightning, also known as the Lightning port, is Apple's proprietary 8-pin reversible connector for charging and data transfer, introduced in 2012 with the iPhone 5.
Lightning AI, Inc.
Lightning AI, Inc., formerly Voltage Park, is a San Francisco AI company formed by a 2026 merger, known for the PyTorch Lightning framework and a GPU cloud.
Lightning arrester
A lightning arrester, also called a lightning diverter or surge arrester, is a device connected between a power conductor and earth that limits overvoltages by diverting surge current to ground and then restoring its high resistance.
Lightning CSS
Lightning CSS is an extremely fast CSS parser, transformer, bundler, and minifier written in Rust, used by Vite, Tailwind CSS, and Parcel, and claimed to be over 100 times faster than CSSnano.
Lightning Memory-Mapped Database
Lightning Memory-Mapped Database (LMDB) is an embedded key-value database library in C, developed for the OpenLDAP Project by Howard Chu and presented at the 2011 LDAP conference.
Lightning Network
The Lightning Network is a layer-2 payment protocol for Bitcoin in which participants open payment channels and route payments off-chain; it was proposed in 2016 and launched on mainnet in 2018.
Lightning rod
The lightning rod, also called a lightning conductor or Franklin rod, is a metal device that safely conducts lightning strikes to ground, invented by Benjamin Franklin in 1750.
LightOn
LightOn is a French AI company founded in Paris in 2016 that builds enterprise document-understanding technology, including the Paradigm generative AI platform and open-weight retrieval models.
LightPath Technologies
LightPath Technologies is an American optics and photonics manufacturer in Orlando, Florida, known for its BlackDiamond germanium-free infrared glass and for shifting from optical components toward infrared imaging systems for defense customers.
Lightricks
Lightricks is an Israeli content-creation technology company founded in Jerusalem in 2013, best known for the Facetune photo-editing app and its LTX Studio AI filmmaking platform.
LightSail
LightSail is a crowdfunded solar sail project of The Planetary Society. LightSail 1 tested sail deployment in 2015, and LightSail 2 demonstrated controlled solar sailing in Earth orbit in 2019.
Lightsource bp
Lightsource bp is a global independent power producer that develops utility-scale solar, wind, and battery storage projects, founded in London in 2010 and fully acquired by BP in 2024.
Lightspeed Commerce
Lightspeed Commerce is a Canadian commerce technology company headquartered in Montreal, founded by Dax Dasilva in 2005, selling point-of-sale software, payments, and financial services to over 100 countries.
LightSpeed Studios
LightSpeed Studios, formerly Lightspeed & Quantum Studios Group, is a Tencent video game studio group founded in 2008 in Shenzhen, best known for PUBG MOBILE.
Lightvessel
A lightvessel, also called a lightship or lightboat, is a ship anchored at sea to mark hazards as an aid to navigation where a lighthouse cannot be built.
Lightweight aggregate concrete
Lightweight aggregate concrete is concrete made with porous, low-density aggregate, giving a density of roughly 70 to 120 lb/ft³ versus about 145 for normal concrete.
Lightweight Directory Access Protocol
Lightweight Directory Access Protocol (LDAP) is an application protocol for querying and modifying directory services over TCP, defined in 1993 and used to authenticate users.
Lightweight markup language
A lightweight markup language, also called a humane markup language, is a plain-text formatting syntax with simple punctuation-based constructs, exemplified by Markdown, AsciiDoc, reStructuredText, and Emacs Org-mode.
Lignin valorization
Lignin valorization is the conversion of lignin, the most abundant renewable aromatic polymer in plant cell walls, into fuels, aromatic chemicals, and materials rather than burning it as low-value fuel.
Lignin-based hard carbon anode
A lignin-based hard carbon anode is a sodium-ion battery anode made by carbonizing lignin, an abundant papermaking byproduct, into hard carbon; Stora Enso's Lignode is the leading commercial example.
Lignite
Lignite, often called brown coal, is the soft, lowest-rank coal with 25%–35% carbon, high moisture, and the lowest energy content, mined near the surface and burned mainly to generate electricity.
LIGO–Virgo–KAGRA
LIGO–Virgo–KAGRA (LVK) is the international network of gravitational-wave detectors LIGO, Virgo, and KAGRA, which jointly detect and localize signals from merging black holes and neutron stars.
Liheng Cai (蔡历恒)
Liheng Cai is a Chinese-born soft materials scientist at the University of Virginia who leads the Soft Biomatter Laboratory and received a 2025 PECASE award.
Lijian-1
Lijian-1 (力箭一号), also known as Kinetica-1, is a Chinese four-stage solid-propellant orbital launch vehicle developed by CAS Space, a commercial company of the Chinese Academy of Sciences.
Lijiaxia hydroelectric plant
Lijiaxia hydroelectric plant (李家峡水电站) is a large dam on the Yellow River in Qinghai, China, with five 400 MW Francis units totaling 2,000 MW; it was the first Chinese hydropower station with a double-row powerhouse arrangement.
Likouala Marine Oil and Gas Field
Likouala Marine is an offshore oil and gas field in the Republic of the Congo, about 50 km south of Pointe-Noire, producing since 1980 and peaking at 26,800 barrels per day in 2014.
Lil Miquela
Lil Miquela (Miquela Sousa) is a computer-generated virtual influencer launched on Instagram in 2016, created by the Los Angeles startup Brud and acquired by Dapper Labs in 2021.
Lili Deligianni
Hariklia "Lili" Deligianni is a Greek-born American chemical engineer who spent three decades at IBM Research and was elected to the National Academy of Engineering in 2019.